Low Temperature Specific Heat of Ordered and Disordered FeCo

Kuentzler, R.

doi:10.1002/pssb.2220580211

Cited by 22 publications

(5 citation statements)

References 12 publications

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“…The values of the electronic specific heat deduced from the density of states of the Fermi level are respectively 2.8 and 3.24 mJ mol-' K-' in the ordered and disordered states. They are in good agreement with the experimental results of Kuentzler (1973); as he observes, the electronic specific heat decreases on ordering by nearly 15%. To be sure that the ferromagnetic solution is more stable at low temperatures, we have to compare its energy to the energy of the corresponding paramagnetic phase.…”

Section: Fecosupporting

confidence: 89%

Effects of order on the electronic structure of ferromagnetic transition metal alloys: application to FeCo and Ni₃Fe

Desjonquères

Lavagna

1979

J. Phys. F: Met. Phys.

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The electronic structures of ordered and disordered transition metal alloys are described in a tight-binding scheme. Charge transfer and magnetism are treated within a self-consistent Hartree-Fock model. We show that the rigid band splitting fails to take account of the ferromagnetism of these compounds. The densities of states of FeCo and Ni,Fe are found to be more sensitive to order than the ferromagnetic properties. Energetic calculations are performed giving an estimation of the ordering energy, and comparisons are made with experimental results.

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Section: Fecosupporting

confidence: 89%

Effects of order on the electronic structure of ferromagnetic transition metal alloys: application to FeCo and Ni₃Fe

Desjonquères

Lavagna

1979

J. Phys. F: Met. Phys.

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“…A more recent study, by Desjonqueres and Lavagna [25], has been devoted to the electronic structure of FeCo and Ni,Fe alloys in connection with the order-disorder Ni (of%)transition. For the FeCo alloy, the values of the electronic specific heat deduced from the calculated density of states a t are in good agreement with the experimental results of Kuentzler [6]. For Ni,Fe a comparison of the calculated values of N ( E~) in the disordered and long-range ordered states is not reliable since, in the ordered state, the Fermi level lies inside an enhanced peak, making N ( E~) very sensitive to the values of the parameters taken in the calculations.…”

Section: Temperature Coefficient Y Of Electronic Specific-heat Cupacitysupporting

confidence: 82%

Effects of short-range order and long-range order on the low-temperature specific heat of Ni3Fe alloys

Calvayrac

Veyssie

1980

Phys. Stat. Sol. (a)

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Low‐temperature measurements of the specific heat of configurationally long‐range ordered and short‐range ordered NiFe alloys are presented, for the composition range from 70 to 75 at% Ni. The low‐temperature specific heat is given by the equation cp = γT + βT3 + αT3/2, the terms corresponding to the electronic, lattice, and spin‐wave contributions, respectively. It is clear that a spin‐wave term is necessary to explain the experimental results. The coefficients γ and β decrease significantly both with short‐range ordering and long‐range ordering. The variation with composition of γ and of the Debye temperature θD (deduced from β) is determined. The change in γ and θD on long‐range ordering is found to remain the same in the composition range investigated. The change in the Debye temperature on ordering is consistent with the change in the elastic properties. The effects on the electronic term are mainly associated with changes in the density of states at the Fermi level. The results are discussed in terms of the existing theoretical calculations for the effect of ordering on the electronic structure of Ni3Fe.

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“…Some attempts were undertaken to find a correlation between the electronic structure and long range atomic order (Küntzler 1973). The formation of superstructures like FeCo, CU3Au, NhFe, ThAI etc.…”

Section: Correlation Between Atomic Interaction and Short Range Atomimentioning

confidence: 99%

High Nitrogen Steels

Gavriljuk¹,

Berns²

1999

Engineering Materials

391

110

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The use of general descriptive names, registered names, trademarks, ete. in this publication does not imply, even in the absence of a specific statement, that such names are exempt from the relevant protective laws and regulations and therefore free for general use.Typesetting: Camera-ready eopies from authors Cover-Design: MEDIO, Berlin Printed on acid-free paper SPIN 10730039 6213020 5 4 3 2 1 0 to BELA and ISOLDE PrefaceDuring the second half of this century the nitrogen concentration of steel moved in both directions: down in constructional grades by oxygen blowing to prevent brittle fracture upon age hardening at ambient temperature and up in stainless grades to improve strength, corrosion resistance and austenite stability. The gradual recognition of the beneficial effects of this element on the properties of high alloy steels led to a widespread development of high nitrogen steels (HNS) documented by numerous applications and the proceedings of five HNS conferences at LilIe (France) 1988, Aachen (Germany) 1990, Kiev (Ukraine) 1993, Kyoto (Japan) 1996 and HelsinkilStockholm (FinnlandISweden) 1998. The word "high" in HNS is not clearly defined but accounts e.g. for 0.1 mass% of nitrogen in creep resistant steels, 0.9 mass% in stainless grades or 2 mass% in tool steels. "High" best refers to "intentionally raised" by appropriate alloying or by pressure and powder metallurgy. For convenience steel grades are designated by their approximate content of alloying elements in mass% omitting unintentional minor additons of Si, Mn, C, P, S asf. As an example Cr22Ni5M03NO.2 stands for a stainless duplex grade.The present book starts by comparing the effects of nitrogen and carbon on the atomic structure and interaction within the crystallattice. Next the constitution of HNS is investigated leading to specific microstructural features. Based on this background the mechanisms behind the mechanical, chemical and tribological properties of HNS are derived. This concludes the fundamentals treated in chapters one to three. Chapter four comes down to shop practice of manufacturing HNS which, in respect to e.g. melting, hot working, and welding, may be quite different from respective carbon grades. In chapter five, different HNS for special applications are presented like e.g. hardenable steels for stainless bearings, high strength austenitic steels for non-magnetic retaining rings, superaustenitic stainless sheet for the chemical industry or solution nitrided impellers for pumps. Chapter six is an attempt to summarize key aspects of HNS.The book is meant for material scientist working in the field of high alloy steels and also for engineers engaged in materials technology, material selection and design. The work covers a wide scope from the atomic structure to the application of HNS and was written by a metal physicist and an engineer.

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Low Temperature Specific Heat of Ordered and Disordered FeCo

Cited by 22 publications

References 12 publications

Effects of order on the electronic structure of ferromagnetic transition metal alloys: application to FeCo and Ni₃Fe

Effects of order on the electronic structure of ferromagnetic transition metal alloys: application to FeCo and Ni₃Fe

Effects of short-range order and long-range order on the low-temperature specific heat of Ni3Fe alloys

High Nitrogen Steels

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Low Temperature Specific Heat of Ordered and Disordered FeCo

Cited by 22 publications

References 12 publications

Effects of order on the electronic structure of ferromagnetic transition metal alloys: application to FeCo and Ni3Fe

Effects of order on the electronic structure of ferromagnetic transition metal alloys: application to FeCo and Ni3Fe

Effects of short-range order and long-range order on the low-temperature specific heat of Ni3Fe alloys

High Nitrogen Steels

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Product

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Effects of order on the electronic structure of ferromagnetic transition metal alloys: application to FeCo and Ni₃Fe

Effects of order on the electronic structure of ferromagnetic transition metal alloys: application to FeCo and Ni₃Fe